Grain-separating screen.



PATENTED MAR. 3, 1903.

G. GLO SZ. GRAIN 'SEPARATING SCREEN.

APPLICATION FILED MAB. 4, 1902.

10 MODEL.

Q07 6 1:95 Ego e UNITED STATES PATENT OFFICE.

CHARLES oLosz, or WEBSTER CITY, lOWA.

GRAIN-SEPARATING SCREEN.

SPECIFICATION forming part of Letters Patent No. 721,940, dated March 3, 19 03.

- Application filed March 4, 1902. Serial No. 961689. (No model) To all whom it may concern:

Be it known that 1, CHARLES 01.0%, a cititive a screen of adjustable slats embodying my improvements. Fig. 2 shows a vertical longitudinal section of the same. Fig. 3 is a transverse section of the same. Fig. 4 is a bottom view of the same, showing the slatrods out of alinement and their connecting adjusting-bar partly broken away. Fig. 5 shows one of the adjustable slats. Fig. 6 is a transverse section of the same, showing the approximate S shape of the slat, which isa feature of my improvement. Fig. 7 is a transverse section of Fig. 2, showing the novel construction of-connecting the pivot-rods 3 3 of two slat-sections by angle-arms side by side engaging the adjusting-bar; and Fig. 8

is alike view showing a modification of such construction in which the angle-arms stand side by side with the slat-rods arranged in alinement.

The screen is used in threshing-machines and is of the type of adjustable pivoted slats having a surface construction particularly adapted for the separation of chaff from the grain by air-currents through openings formed by and between the slats. The screening-surface, however, is adaptedforseparating different kinds of grain or seed by the adjustment of the slats.

The screen-frame 1 is secured in a'shoeframe for endwise movement in the usual manner, and in Figs. 1, 3, and L let 2 indicate a portion of one side of this shoe-frame.

The screen may be of two or more slat-secthereby convex ridges 5 and concave surfaces 6 between the ridges. Transversely the slats are of approximately 8- shape, Fig. 6, each slat curving upward at its scalloped edge and in the opposite direction at its inner edge 7, and the arrangement of the slats is such that their scalloped edges overhang the contiguous slats and form the screening-openings 8 between them. In Fig. 2 the slats are set closed,

with the ends 9 of the scallops restiugon'the ridges 5, the concave surfaces 6 being open, whilein Fig. 6 the 'slats'are set in open relation. The overhanging edge is doubled under from a straight edge corresponding with the ends ofthe scallops, and it is in this straight doubled edge that the scallops are formed by punching out the concave hollows 10, forming thereby the fingers. The under doubled part 11 provides a bearing and soldered fastening 12, Fig. 6, for the slat pivotrod'a'nd gives strength and rigidity to the overhanging edge of the slat, which is important in making this edge scalloped. The upward curve of the slat at its scalloped edge is important to give the proper direction to the blast and also serves the better to collect the grain along the screening-openings. The reverse curve at the underhanging edge of the slat gives a better gathering action of the underblast and a better effect in turning the blastcurrents to suit the adjustment of the slats for different kinds of grain or seeds.

preferably of trough shape and of two parts,

making it convenient for each part to be joined as a single bar on the angle ends,while arranging the arms side by side in close relation gives a compact construction for operating the slat-sections.

The frame-bar parts 4 are screwed together and to the frame, and the hanging-bar parts are also screwed together, and the means whereby it is caused to adjust the slats is the rock-rod 17, fixed to the frame by keepers and having the return-bend 18 slidably engaging an eye 19 on the rear end of said bar, so that by rocking the rod will move the bar in or out, and thereby moving the arms 18 all together rock the slats and regulate the size of the screening-openings to suit the work to be done.

The outer end of the rock rod extends through and beyond the shoe side and is of square cross-section to receive a tubular handle 20, which is fastened by a set-screw 21 to the square end. A rack 22, preferably circular, ,is secured to the outer side of the shoeframe, and through a central opening in this rack the square end of the rock-rod passes. A dog 23 on the handle engages the rack to hold the rock-rod in the position in which it may be set to give the screen-slats the desired adjustment. The locking-dog is held in its engagement with the rack by the tension of a coil-spring 24, with one end against the keeper 25 of the rod, the other end against a pin 26 on the rod, so that the tension of the spring being inward 0n the rod holds the dog 23 in engagement with the rack and by pulling out the handle 20 will free the dog of the rack and allow the rock-rod to be turned to adjust the slats.

By removing the handle the rock-rod will be free to be pulled through the side of the shoe to disengage the rock-rod from the shoe and the return end of the rock-rod from the adjusting-bar to allow the removal of the screen-frame from the shoe when from any cause it may be found necessary.

At its receiving end the frame has a fixed plate 27, its inner end scalloped and having a raised corrugation 28, which. prevents the grain from working back of the screen, while the scalloped edge gives a free passage of the stuff onto the corrugated slats.

At its delivery end the frame has a plate 29, corrugated like the pivoted slats, but fixed to the frame, so that the adjacent pivoted slat overhangs the inner edge of this fixed plate. This causes the chafi and short straw to pass freely from the screen.

I have shown in Figs. 7 and 8 the angle ends 15 of the pivot-rods as standing from each other in the difierent close positions of the angle-arms 13, and in the modification Fig. 8 it will be noted that the slat-rods are journaled in alinement; but the angle-arms stand close side by side in their engagement with the adjusting-bar.

I claim- 1. In a grain-separating screen and in combination a frame, a screening-surface consisting of slats grouped in sections, the slats of one section having pivot-rods journaled in the frame, the ends of said pivot-rods having cranks depending between the slat-sections, each crank terminating in a return angle end 15 standing in opposite directions from each other, a bar engaging said angle ends, and means for adjusting said bar.

2. A grain separator consisting of slats grouped in sections, the slats of one section having pivot-rods journaled in the frame out of alinement with the slats of the other section, the ends of the pivot-rods having cranks depending side by side between the slat-sections, each crank terminating in a return angle end 15 standing in opposite directions from each other a bar engaging said return angle ends, and means for adjusting said bar.

In testimony whereof I aifix my signature in presence of two witnesses.

CHARLES CLOSZ.

Witnesses:

W. J. BIERNATZKI, C. BIERNATZKI. 

